Science: Spectrum

¶ California's Calico Mountains have yielded fossilized aquatic insects
25 million years oldthe oldest ever found. Discovered by a U.S.
Geological Survey team, the specimens included mites, dragonfly nymphs,
fairy shrimps. Almost all were perfectly preserved, showed only minute
differences from their modern counterparts. One scientific explanation
of bugs' slow evolution: more adaptable to climatic change than
mammals, insects have rarely been found to change their bodies to
survive ice ages and warm spells.